Euura acutiserra - oblita group (formerly Phyllocolpa acutiserra)
Males are rare. Only a single specimen of this species is known from Scotland that requires verification as the host plant is not known from the area. See LIston et al (2017) for determination.
Larvae feed on downy willow, which is a plant of uplant areas. The larvae cause a leaf fold, either spirally twisted or a marginal fold.
Size: Female: 3.7 - 4mm, male:3.6 - 4mm
Flight period: Uni- or bivoltine
Plant associations: Salix lapponum (downy willow)
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Liston, A.D., Heibo, E., Prous, M., Vårdal, H., Nyman, T. and Vikberg, V., 2017. North European gall-inducing Euura sawflies (Hymenoptera, Tenthredinidae, Nematinae). Zootaxa, 4302(1), pp.1-115.
Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168